<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="(item,index) in arr" :key="item.id">{{item}}
                <button @click="btns(index)">删除</button>
            </li>
        </ul>
        <button @click="btn">生成</button>
    </div>
    <script src="../vue.js"></script>

    <script>
        const app = new Vue({
            el: '#app',
            data: {
                arr: [1, 5, 3]
            },
            methods: {
                btn() {
                    console.log(12)
                    this.arr.push(Math.floor(Math.random() * 20))
                },
                btns(id) {
                    console.log(id)
                    this.arr.splice(id, 1)
                }
            }
        })
    </script>
</body>

</html>